观察下列各式：

$\sqrt{1+\frac{1}{1^2}+\frac{1}{2^2}}$  =1+ $\frac{1}{1}$ ﹣ $\frac{1}{2}$  =1 $\frac{1}{2}$

$\sqrt{1+\frac{1}{2^2}+\frac{1}{3^2}}$  =1+ $\frac{1}{2}$ ﹣ $\frac{1}{3}$  =1 $\frac{1}{6}$

$\sqrt{1+\frac{1}{3^2}+\frac{1}{4^2}}$  =1+ $\frac{1}{3}$ ﹣ $\frac{1}{4}$  =1 $\frac{1}{12}$

请你根据上面三个等式提供的信息，猜想：

⑴Can we look at the blue jeans?____        A. It's a shirt.

⑵What's this?____                                      B. They're shorts.

⑶What colour is it?____                             C. Here you are.

⑷What are they?____                                 D. It's yellow.